Major update of install.html.

This still needs a great deal of work.  In particular, many of the
./configure command line options are not documented because I was not
able to get them to work in my testing.  However, there is enough
documented here to get most people going.  Hopefully, as things
are fixed, they will get added.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89168 13f79535-47bb-0310-9956-ffa450edef68